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Summary

Printrbot compatible extruder fan duct and mount. This fan duct primarily cools the hot extruded thread. This ducting provides some additional cooling for the extruder collar/mount as well. Design DOE's and optimizations by me. The wonderful CAD work on these were provided by my friend Eric D., as he is so much faster at CAD work than I am.

Instructions

I have three variations of Extruders for my project that I used for fit during this design. The duct mount is meant to fit between your x-carriage mount and your extruder drive. You can attach the fan ducting on the top or bottom of the mount tabs to fit your exact dimensions. The primary cooling output is meant to cool the hot extruded output and not the nozzle. Assure that the ducting does not extend below the extruder nozzle. The secondary cooling output (to the extruder collar/mount)is optimally spaced to be within a half of an inch (~13mm).

Support ribs were specifically incorporated into the design to allow non-cooled printing of these parts, control flow, and to provide additional strength to the ducting.

I get a lot of back flow using a 40mm Noctua fan and it doesn't feel like anything is coming out of the end. Fan is facing the correct direction and it seems to be making a different in my prints. Could it be that the inside is so rough that it is creating turbulence? Or is it just that these little fans don't generate a lot of flow to start with?

Not so, I have had no problem using this part printed out of PLA. And I am printing polycarb @ 230Â°F. I run an insulated hot end though. My testing has shown that the fan shroud is just as effective at 13mm as it is at 3mm, so you could try increasing your spacing from the hotend. My current problem is the flow is uni directional to the part making single wall shells a challenge. I am looking to rework this fan shroud mount to give the option of mounting two fans. Thank you for your feedback

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